City report · Hanoi, Vietnam
Ba Vì Air quality today
Air quality in Ba Vì currently reads AQI 29 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 29
Good
- PM2.5, fine particles (µg/m³)
- 5.8
- tree cover
- 95.7%
- trees in this area
- 298K
- more trees needed
- 0
Measured across a 2 km radius around Yen Bai, Ha Noi, Vietnam (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ba Vì · AQI 29 (Good)
Ba Vì's tree count comes to 298,245 trees across 12.47 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Ba Vì today: AQI 29, Good
Main pollutant: PM2.5 · Observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 185 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 9 station cities within 185 km, e.g. Vinh Phuc and Phuc Yen
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.8
PM10
11.0
NO₂
14.2
O₃
47.0
SO₂
8.5
CO
558.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Ba Vì's daily AQI at 65 on average, from 36 on Nov 10 to an hourly peak of 129 on Nov 4.
Where Ba Vì stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ba Vì: Healthy tree cover
95.7% tree cover against a 30% healthy-neighborhood target, across 12.47 km² of land.
Trees in this area
298,245
Target trees
298,245
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Ba Vì lost?
Since 2001, the area within 10 km of Ba Vì has lost about 1,660 hectares of forest (about 2,300 football pitches): 18% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 384 hectares (23%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from December 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 1,660 haabout 2,300 football pitches
- Share of its forest
- 18%of what there was in 2000
- Cleared for good
- 384 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 84 hectares a year in 2021–2025, against 82 hectares a year in 2016–2020. The worst year was 2015, when about 137 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 5 ha | 17 ha | 23 ha |
| 2002 | 4 ha | 13 ha | 16 ha |
| 2003 | 18 ha | 29 ha | 46 ha |
| 2004 | 7 ha | 25 ha | 32 ha |
| 2005 | 21 ha | 80 ha | 101 ha |
| 2006 | 11 ha | 14 ha | 25 ha |
| 2007 | 24 ha | 41 ha | 64 ha |
| 2008 | 14 ha | 30 ha | 44 ha |
| 2009 | 13 ha | 19 ha | 32 ha |
| 2010 | 28 ha | 23 ha | 50 ha |
| 2011 | 15 ha | 39 ha | 54 ha |
| 2012 | 5 ha | 12 ha | 17 ha |
| 2013 | 11 ha | 74 ha | 84 ha |
| 2014 | 20 ha | 87 ha | 107 ha |
| 2015 | 20 ha | 117 ha | 137 ha |
| 2016 | 19 ha | 98 ha | 117 ha |
| 2017 | 19 ha | 67 ha | 86 ha |
| 2018 | 17 ha | 53 ha | 70 ha |
| 2019 | 16 ha | 48 ha | 65 ha |
| 2020 | 12 ha | 61 ha | 73 ha |
| 2021 | 16 ha | 58 ha | 74 ha |
| 2022 | 13 ha | 65 ha | 77 ha |
| 2023 | 13 ha | 101 ha | 113 ha |
| 2024 | 28 ha | 64 ha | 92 ha |
| 2025 | 18 ha | 46 ha | 65 ha |
What is causing deforestation around Ba Vì?
- Loggingcan grow back76% · 1,260 ha
- Farms, pasture and plantationscleared for good21% · 355 ha
- Towns and roadscleared for good1.7% · 28 ha
Also: storms, floods and other natural causes, shifting farming, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 17,800 ha
- Forest in 2020
- 18,700 ha
- Overall change
- +946 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ba Vì grew from about 17,800 hectares to 18,700 hectares, a net gain of about 946 hectares (+5.3%). New forest grew on about 1,710 hectares, while 760 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
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Frequently asked
Questions about Ba Vì
What is the air quality (AQI) in Ba Vì right now?
The latest reading for Ba Vì shows an AQI of 29 (Good), observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 185 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ba Vì today?
At AQI 29 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Ba Vì been like this week?
Over the last 7 days, the CAMS air-quality model put Ba Vì's daily AQI at 65 on average, from 36 on Nov 10 to an hourly peak of 129 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Ba Vì lost since 2001?
Since 2001, the area within 10 km of Ba Vì has lost about 1,660 hectares of forest (about 2,300 football pitches): 18% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 384 hectares (23%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss has stayed about the same: about 84 hectares a year in 2021–2025, against 82 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Ba Vì grew from about 17,800 hectares to 18,700 hectares, a net gain of about 946 hectares (+5.3%). New forest grew on about 1,710 hectares, while 760 hectares were lost.
What is the tree count in Ba Vì?
Ba Vì has an estimated 298,245 trees across the 12.47 km² of land measured — 95.7% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Ba Vì need?
Ba Vì has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Ba Vì's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Yen Bai; the tree count is an estimate derived from that cover.
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